JP2016021303A - Luminous flux control member, light emitting device and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminous flux control member capable of properly controlling light distribution of emission light from at least one light emitting element even in the case where the light emitting element is arranged on the central axis.SOLUTION: A luminous flux control member 140 has a first luminous flux control member 150 and a second luminous flux control member 160. The first luminous flux control member 150 includes: an incident region 151 including a Fresnel lens part 152 and an incident surface 155; an emission surface 156; and a reflection surface 157. The second luminous flux control member 160 includes a transmission reflection surface 165. The reflection surface 157 is a rotational symmetry surface in which the central axis of the first luminous flux control member 150 is the rotational axis, and it is formed in such a manner that the bus line becomes a recessed curve with respect to the incident surface 155, and the outer peripheral part, compared to the inner peripheral part, is orthogonal with respect to an optical axis LA, which is the center of the total luminous flux of at least one light emitting element 130, and a distance in a direction along the optical axis LA from the orthogonal surface passing an arbitrary point on the incident surface 155 is separated.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light flux controlling member that controls the light distribution of light emitted from at least one light emitting element, and a light emitting device and a lighting device having the light flux controlling member.

  2. Description of the Related Art In recent years, from the viewpoint of energy saving and environmental protection, an illumination device (for example, an LED bulb) using a light emitting diode (hereinafter also referred to as “LED”) as a light source has been developed as an illumination device that can replace an incandescent bulb. However, the emitted light from the LED has a feature that the straightness is strong as compared with the emitted light from the incandescent bulb. For this reason, in order to use the LED light bulb in the same manner as the incandescent light bulb, it is important to distribute the light emitted from the LED in a balanced manner in all the directions of the front direction, the side direction, and the rear direction.

  As an example of such an illuminating device, an illuminating device having a plurality of LED modules and a lens for controlling light distribution of light emitted from the plurality of LED modules is known (for example, see Patent Document 1). ). FIG. 1 is a perspective view of the LED module 10 and the lens 20 described in Patent Document 1. FIG. The illumination device described in Patent Literature 1 includes a substrate (not shown), seven LED modules 10 disposed on the substrate, and an annular lens 20 disposed on the seven LED modules 10. One LED module 10 is arranged on the central axis of the lens 20, and the remaining six LED modules 10 are arranged in an annular shape around the LED module 10. The lens 20 has an incident surface 21 on which the outgoing light from the LED module 10 is incident and an outgoing surface 22 on which the incident light is emitted. The incident surface 21 is disposed so as to face the LED module 10 in the annular lens 20. The emission surface 22 is disposed outside the annular lens 20. The lens 20 causes a part of the light emitted from the LED module 10 to be incident on the incident surface 21 and to be emitted toward the front direction, the side direction, and the rear direction on the output surface 22. In addition, the annular lens 20 allows another part of the light emitted from the LED module 10 to pass forward from the cavity. Thus, the illuminating device described in Patent Document 1 can distribute the light emitted from the LED module 10 in all directions of the front direction, the side direction, and the rear direction.

JP 2013-84346 A

  In the illuminating device described in Patent Document 1, a part of the light emitted from the LED module 10 (light emitting element) arranged at the center also enters the incident surface 21 of the lens 20 (light flux controlling member). However, although the lens 20 described in Patent Document 1 can appropriately control the light distribution of the emitted light from the LED module 10 arranged around the central LED module 10, the lens 20 from the LED module 10 arranged in the center can be controlled. The light distribution of incident light cannot be appropriately controlled. Therefore, in the illuminating device described in Patent Document 1, the emitted light from the light emitting element disposed on the central axis of the light flux controlling member cannot be distributed in a well-balanced manner in all directions including the forward direction, the lateral direction, and the backward direction. There is a problem.

  The present invention has been made in view of the above points, and appropriately controls the light distribution of emitted light from at least one light emitting element even when the light emitting element is arranged on the central axis thereof. An object of the present invention is to provide a luminous flux control member that can be used. Another object of the present invention is to provide a light emitting device and a lighting device having the light flux controlling member.

  The light flux controlling member according to the present invention is a light flux controlling member for controlling the light distribution of the light emitted from at least one light emitting element, the Fresnel lens portion arranged so as to surround the central axis thereof, and the Fresnel lens. Including an incident surface arranged outside the unit, the incident region where the light emitted from the light emitting element is incident, and the opposite side of the incident region, which emits a part of the incident light incident on the incident region A first light flux controlling member including an exit surface to be output and a reflection surface disposed outside the exit surface and reflecting another part of the incident light, and disposed at a position facing the exit surface and the reflection surface. And a second light flux control member including a transmission reflection surface that transmits a part of the light that has been emitted and reached and reflects the remaining light, and the reflection surface includes the first light flux control member. Rotation around the center axis of The outer surface of the light emitting element has an optical axis that is the center of the total luminous flux of the light emitting element as compared with the inner peripheral portion of the light emitting element. The transmission / reflection surface is formed so that a distance in a direction along the optical axis from an orthogonal surface that is orthogonal to the incident surface and passes through an arbitrary point on the incident surface is separated, and the center axis of the second light flux controlling member is a rotation axis And the outer peripheral portion of the rotational symmetry plane is a concave curve with respect to the first light flux controlling member, and the outer peripheral portion is in the direction along the optical axis as compared with the central portion. The configuration is such that the distance from the orthogonal plane is increased.

  A light emitting device according to the present invention includes a substrate, at least one light emitting element disposed on the substrate, and a light flux controlling member according to the present invention disposed on the light emitting element. The structure is arranged at a position facing a part of the incident surface and at least a part of the Fresnel lens part.

  An illumination device according to the present invention includes a light emitting device according to the present invention, a cover that covers the light flux controlling member and allows light emitted from the light emitting device to pass through while diffusing, and a housing that supports the light emitting device and the cover. And having a configuration.

  In the light emitting device and the illuminating device having the light flux controlling member according to the present invention, even when the light emitting element is arranged on the central axis of the light flux controlling member, the emitted light from at least one light emitting element is directed in the forward direction, It is possible to distribute in a well-balanced manner in all the lateral and backward directions. Therefore, according to the present invention, it is possible to provide an illuminating device that can illuminate a room extensively using reflected light from a ceiling or a wall surface like an incandescent bulb.

FIG. 1 is a perspective view of an LED module and a lens described in Patent Document 1. FIG. FIG. 2 is a cross-sectional view of a main part of the illumination device according to the embodiment. FIG. 3 is a diagram showing the arrangement of the light emitting elements on the substrate. 4A is a cross-sectional view showing a configuration of a light flux controlling member according to the embodiment, and FIG. 4B is a partially enlarged cross-sectional view of a region indicated by a broken line in FIG. 4A. 5A to 5D are diagrams showing the configuration of the first light flux controlling member and the holder. 6A to 6D are diagrams illustrating the configuration of the second light flux controlling member. FIG. 7 is a cross-sectional view illustrating a configuration of a light flux controlling member according to Comparative Example 2. FIG. 8 is a graph showing the simulation results of the light distribution characteristics for the lighting apparatuses according to Comparative Example 1, Comparative Example 2, and the embodiment. 9A to 9C are graphs showing simulation results of light distribution characteristics for the lighting apparatus according to the present embodiment from which the lighting apparatus and the holder according to Comparative Example 3 are removed. FIG. 10 is a diagram illustrating an example of the arrangement of the light emitting elements on the substrate.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, a lighting device that can be used in place of an incandescent bulb will be described as a representative example of the lighting device according to the present invention.

(Configuration of lighting device)
FIG. 2 is a cross-sectional view of a main part showing a configuration of lighting apparatus 100 according to the embodiment. As illustrated in FIG. 2, the lighting device 100 includes a housing 110, a light emitting device 120, and a cover 180. Hereinafter, each component will be described. In the following description, the “optical axis of a plurality of light emitting elements” refers to the traveling direction of light at the center of the total luminous flux emitted three-dimensionally from the plurality of light emitting elements 130. Further, the emission direction (A direction shown in FIG. 2) along the optical axis LA of the light emitting element 130 is defined as the front, and the opposite direction (B direction shown in FIG. 2) is defined as the rear.

  The housing 110 supports the light emitting device 120 and the cover 180 at the front end of the housing 110, respectively. As shown in FIG. 2, the housing 110 includes a base 111 and a housing main body 112 disposed on the front side of the base 111. The shape of the housing body 112 is determined according to the light distribution characteristics of the light flux controlling member 140. In the present embodiment, the casing body 112 has a truncated cone shape so as not to block the light emitted from the cover 180.

  A power supply circuit (not shown) that electrically connects the base 111 and the light emitting element 130 is disposed inside the housing body 112. The housing body 112 is also a heat sink for releasing heat from the light emitting element 130. For this reason, it is preferable that the housing body 112 is made of a metal having high thermal conductivity. Examples of the material of the housing body 112 include aluminum and copper.

  The light emitting device 120 is mounted on the housing 110. The light emitting device 120 includes a substrate 125, a plurality of light emitting elements 130, and a light flux controlling member 140.

  The substrate 125 is fixed to the housing body 112. A plurality of light emitting elements 130 and a light flux controlling member 140 are fixed on one surface of the substrate 125. The shape and size of the substrate 125 are not particularly limited, and can be set as appropriate according to the size of the lighting device 100, the number and size of the light emitting elements 130, and the like. FIG. 3 is a plan view showing the substrate 125 and the plurality of light emitting elements 130. As shown in FIG. 3, the planar view shape of the substrate 125 is a substantially circular shape. The type of the substrate 125 is not particularly limited. Examples of the substrate 125 include an aluminum substrate, a glass composite substrate, and a glass epoxy substrate.

  The plurality of light emitting elements 130 are disposed on the substrate 125 and are light sources of the lighting device 100. For example, the plurality of light emitting elements 130 are light emitting diodes (LEDs) such as white light emitting diodes. The number of the light emitting elements 130 is not particularly limited. In the present embodiment, the number of light emitting elements 130 is five. The position of each light emitting element 130 on the substrate 125 is not particularly limited as long as it is a position facing a part of the incident surface 155 (described later) and at least a part of the Fresnel lens portion 152 (described later). The position of each light emitting element 130 can be changed as appropriate according to the shape and size of the light flux controlling member 140. For example, the plurality of light emitting elements 130 may be arranged in an annular shape on the substrate 125 or in an array. In the present embodiment, as shown in FIG. 3, one light emitting element 130 is disposed at the center of the substrate 125, and the remaining four light emitting elements 130 are disposed at equal intervals on the outer side (periphery). When it is assumed that the virtual circle C is arranged on the substrate 125, one light emitting element 130 arranged at the center of the substrate 125 is arranged at the center of the virtual circle C, and four light emitting elements arranged outside. 130 are arranged at equal intervals on the circumference of the virtual circle C. At this time, at least one of the four light emitting elements 130 arranged on the outer side overlaps with the inner edge of the reflective surface 157 (described later) when viewed from the second light flux controlling member 160 (described later) side. It is preferable that they are arranged. From the viewpoint of reflecting the emitted light from the light emitting element 130 more efficiently, the optical axis LA of at least one light emitting element 130 among the plurality of light emitting elements 130 arranged on the outside overlaps the inner edge of the reflecting surface 157. It is preferable that the optical axes LA of all the light emitting elements 130 arranged on the outer side overlap the inner edge of the reflecting surface 157. In the present embodiment, when viewed from the second light flux controlling member 160 side, the four light emitting elements 130 arranged on the outside are arranged such that the optical axis LA overlaps the inner edge of the reflecting surface 157.

  The light flux controlling member 140 controls the light distribution of the emitted light from the plurality of light emitting elements 130. More specifically, the light flux controlling member 140 distributes the emitted light from the plurality of light emitting elements 130 in a well-balanced manner in all directions including the forward direction, the lateral direction, and the backward direction. The light flux controlling member 140 is disposed on the substrate 125 so as to cover the plurality of light emitting elements 130 (see FIG. 2). Details of the light flux controlling member 140 will be described later.

  The cover 180 covers the light emitting device 120 and diffuses and transmits the light emitted from the light emitting device 120 (light flux controlling member 140). The cover 180 forms a hollow region having an opening. The light emitting device 120 is disposed in the hollow area of the cover 180. The cover 180 preferably has a rotationally symmetric shape with respect to the optical axis LA of the light emitting element 130 disposed at the center of the substrate 125 among the plurality of light emitting elements 130 from the viewpoint of emitting light in a balanced manner. The shape of the cover 180 is preferably a shape that can further improve the balance of the light distribution of the light emitted from the light emitting device 120. For example, the shape of the cover 180 is preferably a shape in which the opening diameter of the cover is shorter than the maximum outer diameter of the cover 180 from the viewpoint of increasing the ratio of outgoing light in the backward direction. The shape of the cover 180 is, for example, a spherical crown shape (a shape obtained by cutting a part of a spherical surface with a plane). The maximum outer diameter D1 of the cover 180 is, for example, 60 mm, and the opening diameter D2 of the cover 180 is, for example, 38 mm (see FIG. 2).

  The cover 180 has light transmittance and light diffusibility. The material of the cover 180 is not particularly limited as long as it has light transmittance and light diffusibility. For example, the material of the cover 180 is light transmissive resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), and epoxy resin (EP), or glass. The means for imparting light diffusing power to the cover 180 is not particularly limited. For example, the inner surface or outer surface of a cover made of a transparent material may be subjected to light diffusion treatment (for example, roughening treatment), or the above-mentioned transparent material includes light diffusing properties including scatterers such as beads. These materials may be blended.

(Configuration of luminous flux control member)
Next, the configuration of the light flux controlling member 140 according to the present embodiment will be described. 4A is a cross-sectional view of light flux controlling member 140, and FIG. 4B is a partially enlarged cross-sectional view of a region indicated by a broken line in FIG. 4A.

  As shown in FIG. 4A, the light flux control member 140 includes a first light flux control member 150, a second light flux control member 160, and a holder 170. In the present embodiment, first light flux controlling member 150 is formed integrally with holder 170. The first light flux controlling member 150 is disposed inside the holder 170 so as to face the light emitting element 130. The rear end portion of the holder 170 is fixed to the substrate 125. The second light flux controlling member 160 is fixed to the front end portion of the holder 170 so as to close the front opening of the holder 170 (so as to cover the first light flux controlling member 150). The central axis CA1 of the first light flux controlling member 150, the central axis CA2 of the second light flux controlling member 160, and the central axis CA3 of the holder 170 are coincident with each other. In the present embodiment, the central axes CA1, CA2, and CA3 coincide with the optical axes LA of the plurality of light emitting elements 130 (see FIG. 2). Furthermore, in the present embodiment, among the plurality of light emitting elements 130, the optical axis LA of the light emitting element 130 disposed at the center of the substrate 125 coincides with the central axis CA1.

  FIG. 5 is a diagram illustrating the configuration of the first light flux controlling member 150 and the holder 170. 5A is a plan view of the first light flux controlling member 150 and the holder 170, FIG. 5B is a side view, FIG. 5C is a bottom view, and FIG. 5D is a DD line shown in FIG. 5A. FIG. As shown in FIG. 5A, the planar view shape of the first light flux controlling member 150 is a substantially circular shape. The first light flux controlling member 150 is formed integrally with the holder 170, and is disposed with respect to the light emitting element 130 through an air layer (see FIG. 2).

  As shown in FIGS. 5A to 5D, the first light flux controlling member 150 is disposed on the incident area 151 where the outgoing light from the light emitting element 130 is incident and on the opposite side (front side) of the incident area 151, and the incident area 151. The exit surface 156 that emits a part of the incident light incident in the forward direction and the lateral direction, and the other part of the incident light incident on the incident region 151 are disposed in the lateral direction and the outer surface 156. And a reflective surface 157 that reflects in the backward direction.

  As shown in FIG. 4A, the incident area 151 allows the emitted light from the light emitting element 130 to enter the first light flux controlling member 150. The incident region 151 is disposed on the rear side of the first light flux controlling member 150. The incident area 151 includes a Fresnel lens portion 152 disposed at the center and an incident surface 155 disposed outside the Fresnel lens portion 152.

  The Fresnel lens unit 152 mainly causes a part of the emitted light from the light emitting element 130 disposed at the center of the substrate 125 (on the central axis CA1 of the first light flux controlling member 150) to enter the first light flux controlling member 150. At the same time, incident light is reflected toward the exit surface 156. The Fresnel lens portion 152 is disposed so as to intersect the central axis CA1 (optical axis LA) of the first light flux controlling member 150. In addition, a refracting surface for refracting light emitted from the light emitting element 130 may or may not be disposed at the center of the Fresnel lens portion 152. In the present embodiment, a refractive surface 153 is disposed inside the Fresnel lens portion 152.

  The refracting surface 153 mainly enters a part of the light emitted from the light emitting element 130 arranged at the center of the substrate 125 (light emitted at a small angle with respect to the optical axis LA) into the first light flux controlling member 150. And refracting incident light toward the exit surface 156. As shown in FIG. 2, the refracting surface 153 is disposed at a position facing the light emitting element 130 disposed at the center of the substrate 125 so as to intersect the central axis CA1 (optical axis LA) of the first light flux controlling member 150. Has been. The refracting surface 153 is a rotationally symmetric surface having the central axis CA1 as a rotation axis. The shape of the refracting surface 153 is not particularly limited as long as the above function can be exhibited. The shape of the surface of the refracting surface 153 is constituted by, for example, a flat surface, a spherical surface, an aspherical surface, a refractive Fresnel lens, or a combination thereof. In the present embodiment, the surface shape of the refracting surface 153 is a plane perpendicular to the central axis CA1 of the first light flux controlling member 150, and the plan view shape of the refracting surface 153 is a substantially circular shape.

  The plurality of ridges 154 mainly uses a part of the light emitted from the light emitting element 130 disposed at the center of the substrate 125 (light emitted at a relatively large angle with respect to the optical axis LA) as the first light flux controlling member. While making it enter into 150, incident light is reflected toward the output surface 156. The plurality of ridges 154 are arranged concentrically outside the refracting surface 153 and so as to form valleys between two adjacent ridges 154. The shape and size of the ridge 154 are not particularly limited as long as the above function can be exhibited. In the present embodiment, the shape of the ridge 154 is an annular shape. Further, the cross-sectional areas of the plurality of ridges 154 in the plane including the central axis CA1 of the first light flux controlling member 150 may be the same or different. In the present embodiment, the sizes of the plurality of ridges 154 are different from each other. Further, as shown in FIG. 4B, in the optical axis LA direction (center axis CA1 direction), the distance d between the rear end portion of the holder 170 and the tip end portion of each protrusion 154 increases from the inside toward the outside. It is getting shorter gradually. Hereinafter, the plane including the rear end of the holder 170 of the light flux controlling member 140 is referred to as a “reference plane”.

  As shown in FIG. 4B, the ridge 154 has a first inclined surface 154a and a second inclined surface 154b. In the ridge 154, the first inclined surface 154a is disposed on the inner side (the central axis CA1 side of the first light flux controlling member 150), and the second inclined surface 154b is disposed on the outer side.

  The first inclined surface 154a mainly causes a part of the light emitted from the light emitting element 130 disposed at the center of the substrate 125 to be incident and refracted toward the second inclined surface 154b. The first inclined surface 154a is a rotationally symmetric surface having the central axis CA1 of the first light flux controlling member 150 as a rotation axis, and has an annular shape. The first inclined surface 154a may be parallel to the central axis CA1, but is preferably slightly inclined with respect to the central axis CA1 from the viewpoint of forming the first light flux controlling member 150. In this case, the first inclined surface 154a is inclined so as to be away from the central axis CA1 of the first light flux controlling member 150 as it approaches the reference surface. In the plurality of ridges 154, the inclination angles of the first inclined surface 154a with respect to the central axis CA1 may be the same or different. In the present embodiment, in the plurality of ridges 154, the inclination angles of the first inclined surfaces 154a are different from each other. Further, the generatrix of the first inclined surface 154a may be a straight line or a curved line. In the present embodiment, the bus line of the first inclined surface 154a is a straight line. The “bus line” generally means a straight line that draws a ruled surface, but in this specification, it is used as a word including a curve for drawing a rotationally symmetric surface. When the generatrix of the inclined surface is a curve, the “inclined angle of the inclined surface” means the angle of the tangent line of the inclined surface with respect to the central axis CA1.

  The second inclined surface 154b is formed in a pair with the first inclined surface 154a, and reflects incident light incident on the first inclined surface 154a toward the output surface 156. The second inclined surface 154b is a rotationally symmetric surface with the central axis CA1 of the first light flux controlling member 150 as a rotation axis, and has an annular shape. The second inclined surface 154b is preferably inclined with respect to the central axis CA1 from the viewpoint of total reflection of the reached light. In this case, the second inclined surface 154b is inclined so as to approach the central axis CA1 as it approaches the reference surface. In the plurality of ridges 154, the inclination angles of the second inclined surface 154b with respect to the central axis CA1 may be the same or different. In the present embodiment, in the plurality of ridges 154, the inclination angles of the second inclined surfaces 154b are different from each other. Moreover, a straight line may be sufficient as the bus line which comprises the 2nd inclined surface 154b, and a curve may be sufficient as it. In the present embodiment, the bus line of the second inclined surface 154b is a straight line.

  The incident surface 155 is disposed outside the Fresnel lens portion 152. The incident surface 155 mainly causes a part of the emitted light from the light emitting element 130 disposed outside the plurality of light emitting elements 130 to enter the first light flux controlling member 150 and directs the incident light toward the reflecting surface 157. To refract. The shape of the surface of the incident surface 155 may be a flat surface or a curved surface. Further, the incident surface 155 may or may not be perpendicular to the central axis CA1 of the first light flux controlling member 150. In the present embodiment, incident surface 155 is a plane orthogonal to central axis CA1.

  The exit surface 156 causes the incident light incident on the refracting surface 153 and the reflected light incident on the first inclined surface 154a and reflected on the second inclined surface 154b to be emitted toward the second light flux controlling member 160. The exit surface 156 is disposed on the front side of the first light flux controlling member 150 so as to face the second light flux controlling member 160. The shape of the emission surface 156 may be a flat surface or a curved surface. Further, the emission surface 156 may be perpendicular to the central axis CA1 of the first light flux controlling member 150 or may not be perpendicular. In the present embodiment, emission surface 156 is a plane perpendicular to central axis CA1.

  The reflection surface 157 reflects the incident light incident on the incident surface 155. The reflection surface 157 is disposed on the front side of the first light flux control member 150 and on the outer side of the emission surface 156 so as to face the second light flux control member 160. The reflection surface 157 is a rotationally symmetric surface with the central axis CA1 of the first light flux controlling member 150 as the rotation axis. The generatrix that constitutes the reflecting surface 157 is formed to be a concave curve with respect to the incident surface 155 as it goes from the inner periphery to the outer periphery. Further, the outer peripheral portion of the reflecting surface 157 is formed at a position (front side) that is farther from the incident surface 155 in the direction of the optical axis LA (the direction of the central axis CA1) than the inner peripheral portion thereof. Yes. In other words, the reflection surface 157 extends along the optical axis LA from the orthogonal surface (for example, the incident surface 155) that is orthogonal to the optical axis LA and passes through an arbitrary point on the incident surface as it goes from the inner periphery to the outer periphery. It is an aspherical curved surface with a long distance in the direction. In this case, the angle of the reflecting surface 157 with respect to the central axis CA1 of the first light flux controlling member 150 increases as it goes from the inner periphery to the outer periphery.

  The material of the first light flux controlling member 150 is not particularly limited as long as it has a high transmittance that allows light having a desired wavelength to pass therethrough. For example, the material of the first light flux controlling member 150 is a light transmissive resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), and epoxy resin (EP), or glass. The first light flux controlling member 150 is formed by injection molding, for example.

  Further, from the viewpoint of totally reflecting light, a metal layer made of silver, aluminum, gold, copper, an alloy thereof, or the like may be disposed on the reflection surface 157 of the first light flux controlling member 150. The metal layer can be formed, for example, by vapor deposition or sputtering.

  6A to 6D are diagrams showing the configuration of the second light flux controlling member 160. FIG. 6A is a plan view of the second light flux controlling member 160, FIG. 6B is a side view, FIG. 6C is a bottom view, and FIG. 6D is a cross-sectional view taken along the line DD shown in FIG. 6A. It is.

  The second light flux controlling member 160 transmits part of the light reaching from the first light flux controlling member 150 in the forward direction and the lateral direction, and reflects the remaining part in the lateral direction and the backward direction. As shown in FIG. 6A, the planar view shape of the second light flux controlling member 160 is a substantially circular shape. The second light flux control member 160 is disposed with respect to the first light flux control member 150 via an air layer (see FIG. 2). The second light flux controlling member 160 includes a transmission / reflection surface 165 for performing the above function.

  The transmission / reflection surface 165 transmits a part of the light emitted from the emission surface 156 of the first light flux control member 150 and reaches the second light flux control member 160 and reflects the remaining part. The transmission / reflection surface 165 is disposed so as to face the emission surface 156 and the reflection surface 157 of the first light flux controlling member 150. The transmission / reflection surface 165 is a rotationally symmetric surface with the central axis CA2 of the second light flux controlling member 160 as the rotation axis. The generatrix forming the transmission / reflection surface 165 is formed to be a concave curve with respect to the first light flux controlling member 150 from the center of the rotationally symmetric surface to the outer periphery. Further, the outer peripheral portion of the transmission / reflection surface 165 is located at a position (a distance from the above-described orthogonal surface (for example, the incident surface 155) in the direction along the optical axis LA (center axis CA2) (compared to the center portion). It is formed on the front side. That is, the transmission / reflection surface 165 is an aspherical curved surface in which the distance from the first light flux controlling member 150 in the direction of the optical axis LA increases from the central portion toward the outer peripheral portion. In this case, the angle of the transmission / reflection surface 165 with respect to the central axis CA2 of the second light flux controlling member 160 increases from the center toward the outer peripheral portion. Note that the surface of the second light flux controlling member 160 facing the first light flux controlling member 150 is preferably formed to be a glossy surface. Further, the transmission / reflection film 165 may be formed integrally with the second light flux controlling member 160 or may be formed as a separate body.

  The means for giving the above function to the second light flux controlling member 160 is not particularly limited. An example of means for imparting the above function to the second light flux controlling member 160 includes forming the second light flux controlling member 160 from a light transmissive material having a desired light transmittance. In this case, examples of the light transmissive material having a desired light transmittance include resin and glass. Examples of the light transmissive resin having a desired light transmittance include a white resin such as an acrylic resin. By adjusting the light transmittance of the material of the second light flux controlling member 160, the ratio of outgoing light in each direction can be adjusted.

Further, as another example of means for imparting the above function to the second light flux controlling member 160, a transmission / reflection film is disposed on the rear side (first light flux controlling member 150 side) of the second light flux controlling member 160. Can be mentioned. In this case, the material of the second light flux controlling member 160 may be a material that does not reflect light. An example of the material of the second light flux controlling member 160 is the same as that of the first light flux controlling member 150. Examples of the transmission / reflection film include a multilayer film of TiO ₂ and SiO _2, a multilayer film of ZrO ₂ and SiO _2, a multilayer film of Ta ₂ O ₅ and SiO ₂ , and aluminum (Al). A metal thin film or the like.

  Further, as another example of the means for imparting the above function to the second light flux controlling member 160, it is possible to disperse scatterers such as beads inside the second light flux controlling member 160 made of a light transmissive material. Can be mentioned. That is, the second light flux controlling member 160 may be formed of a material that transmits part of the reached light and reflects the remaining part.

  Furthermore, another example of means for imparting the above function to the second light flux controlling member 160 is to form a light transmitting portion on the second light flux controlling member 160 made of a light reflective material. Examples of the light reflective material include white resin and metal. Examples of the light transmitting part include a through hole and a recessed part with a bottom. In the latter case, the emitted light from the first light flux controlling member 150 passes through the bottom of the recess (the portion where the thickness is thin). For example, the second light flux controlling member 160 having both light reflectivity and light transmissivity using white polymethyl methacrylate having a visible light transmittance of about 20% and a reflectance of about 80%. Can be produced.

  The holder 170 holds the first light flux control member 150 and the second light flux control member 160. The holder 170 is fixed to the substrate 125 at the rear end thereof, and fixes the first light flux control member 150 and the second light flux control member 160 to a predetermined position with respect to the light emitting element 130 on the substrate 125. As shown in FIG. 5, the shape of the holder 170 is a substantially cylindrical shape with the central axis CA <b> 3 of the holder 170 as the rotation axis. The holder 170 may be formed integrally with the first light flux controlling member 150 or may be formed as a separate body. In the present embodiment, holder 170 is formed integrally with first light flux controlling member 150 disposed at the center thereof.

  The holder 170 has a structure for fixing the second light flux controlling member 160 at its front end. Moreover, the holder 170 has a structure for being fixed to the board | substrate 125 in the back side edge part. For example, the holder 170 has a front guide protrusion 171 at its front end and a rear guide protrusion 172 at its rear end.

  The shape and number of the front guide protrusions 171 are not particularly limited as long as the second light flux controlling member 160 can be fixed to the holder 170. As shown in FIGS. 5A and 5D, in the present embodiment, the shape of the front guide protrusion 171 is an annular shape formed around the entire circumference at the front end portion of the holder 170. The front guide protrusion 171 may be divided into a plurality of parts.

  The shape and number of the rear guide protrusions 172 are not particularly limited as long as the holder 170 can be fixed to the substrate 125. As shown in FIGS. 5C and 5D, in the present embodiment, the shape of the rear guide protrusion 172 is an annular shape formed over the entire circumference at the rear end portion of the holder 170. Note that the rear guide protrusion 172 may be divided into a plurality of parts.

  The holder 170 is light transmissive. The material of the holder 170 is not particularly limited as long as light having a desired wavelength can pass therethrough. For example, the material of the holder 170 is the same as that of the first light flux controlling member 150.

  Note that the holder 170 may be provided with a light diffusing ability. When the light diffusing ability is imparted to the holder 170, the holder 170 may include a scatterer, or the surface of the holder 170 may be subjected to a light diffusing process.

  The light flux control member 140 can be manufactured by assembling the second light flux control member 160 into an integrally molded product of the first light flux control member 150 and the holder 170. The integrally molded product of the first light flux controlling member 150 and the holder 170 can be manufactured by injection molding using, for example, a colorless and transparent resin material. The second light flux controlling member 160 can be manufactured, for example, by injection molding using a white resin material. Alternatively, the second light flux controlling member 160 can be manufactured by injection-molding using a colorless and transparent resin material and then forming a transmission / reflection film on the surface to be the transmission / reflection surface 165 by vapor deposition.

  The second light flux controlling member 160 is fixed to the front side end of the holder 170. The method for fixing the second light flux controlling member 160 to the holder 170 is not particularly limited. Examples of the method for fixing the second light flux controlling member 160 to the holder 170 include fixing with an adhesive or the like. At this time, the front guide protrusion 171 prevents the second light flux controlling member 160 from moving in the radial direction of the holder 170.

  The light flux controlling member 140 is fixed to the substrate 125 via the rear end portion of the holder 170. The method for fixing the light flux controlling member 140 to the substrate 125 is not particularly limited. Examples of the method for fixing the light flux controlling member 140 to the substrate 125 include fixing with an adhesive or the like. At this time, the rear guide protrusion 172 prevents the light flux controlling member 140 from moving in the radial direction of the holder 170. Accordingly, the holder 170 can be fixed to the housing 110 at a predetermined position, and the first light flux control member 150 and the second light flux control member 160 can be fixed to the light emitting element 130 at predetermined positions.

  The light flux control member 140 may be manufactured by separately molding the first light flux control member 150 and the holder 170 and assembling the first light flux control member 150 and the second light flux control member 160 to the holder 170. By molding the first light flux controlling member 150 and the holder 170 separately, the degree of freedom in selecting materials is improved when the holder 170 and the first light flux controlling member 150 are shaped. For example, it is easy to mold the holder 170 with a light transmissive material including a scatterer and mold the first light flux controlling member 150 with a light transmissive material not including a scatterer.

(Light distribution characteristics of light-emitting device)
Next, the light distribution characteristic of the light emitting device 120 according to the present embodiment will be described. First, the optical path in the light beam control member 140 of the emitted light from the light emitting element 130 will be described. In the following description, with respect to the light emission direction, when the optical axis LA direction is 0 °, the direction of 0 ° or more and 60 ° or less is referred to as “forward direction”, and the direction of more than 60 ° and 120 ° or less. The direction is referred to as “lateral direction”, and the direction exceeding 120 ° and 180 ° or less is referred to as “rear direction”.

  First, light emitted from the light emitting element 130 arranged at the center of the substrate 125 (on the central axes CA1, CA2, and CA3 of the light flux controlling member 140) will be described. Out of the light emitted from the light emitting element 130 disposed at the center of the substrate 125, light having a small angle with respect to the optical axis LA is incident on the first light flux controlling member 150 through the refracting surface 153 and the second light flux is emitted through the outgoing surface 156. The light is emitted toward the control member 160. Thereafter, the emitted light reaches the second light flux controlling member 160. Of the light emitted from the light emitting element 130 arranged at the center of the substrate 125, light having a large angle with respect to the optical axis LA is incident on the first light flux controlling member 150 through the first inclined surface 154 a of the Fresnel lens portion 152. Then, the light is reflected by the second inclined surface 154 b and emitted toward the second light flux controlling member 160 by the emission surface 156. Thereafter, the emitted light reaches the second light flux controlling member 160. Further, among the light emitted from the light emitting element 130 disposed at the center of the substrate 125, the light having a larger angle with respect to the optical axis LA is incident on the incident surface 155 disposed outside the Fresnel lens unit 152. The light enters the inside 150, is refracted toward the reflecting surface 157, and reaches the reflecting surface 157.

  Next, light emitted from the light emitting element 130 arranged outside the plurality of light emitting elements 130 will be described. A part of the emitted light from the light emitting element 130 disposed outside the incident light enters the first light flux controlling member 150 at the incident surface 155, is refracted toward the reflecting surface 157, and reaches the reflecting surface 157. In addition, another part of the light emitted from the light emitting element 130 disposed on the outside is incident on the first light flux controlling member 150 by the Fresnel lens unit 152 and is directed to the second light flux controlling member 160 by the light exit surface 156. Are emitted. Thereafter, the emitted light reaches the second light flux controlling member 160.

  A part of the light reaching the reflection surface 157 is reflected by the reflection surface 157 in the lateral direction and the backward direction. The light reflected by the reflecting surface 157 in the lateral direction and the rearward direction is transmitted through the holder 170 and reaches the side portion and the lower portion of the cover 180. At this time, the reflection surface 157 distributes the emitted light in the lateral direction and the rearward direction toward the front side as the position where the incident light enters the reflection surface 157 is closer to the inner peripheral portion. Further, the reflection surface 157 distributes the emitted light in the lateral direction and the rearward direction toward the rear side as the position where the arrived light enters the reflection surface 157 is closer to the outer peripheral portion. Further, another part of the light that has reached the reflecting surface 157 is emitted toward the second light flux controlling member 160 by the reflecting surface 157. Thereafter, the emitted light reaches the second light flux controlling member 160.

  A part of the light reaching the second light flux controlling member 160 is transmitted through the transmission / reflection surface 165 and emitted in the forward direction and the lateral direction. This emitted light reaches the side and upper part of the cover 180. Further, the other part of the light reaching the second light flux controlling member 160 is reflected by the transmission / reflection surface 165 and is emitted in the lateral direction and the backward direction. This emitted light is transmitted through the holder 170 and reaches the side and lower portions of the cover 180. At this time, the transmission / reflection surface 165 distributes the outgoing light in the lateral direction and the rearward direction toward the front side as the position where the incident light enters the transmission / reflection surface 165 is closer to the center. Further, the transmission / reflection surface 165 distributes the outgoing light in the lateral direction and the rearward direction toward the rear side as the position where the incident light enters the transmission / reflection surface 165 is closer to the outer peripheral portion. Further, the first light flux controlling member 150 can efficiently collect the emitted light from the light emitting element 130 disposed at the center by the Fresnel lens portion 152 on the central axis CA2 side of the second light flux controlling member 160. For this reason, the light flux controlling member 140 can increase the ratio of the outgoing light in the lateral direction and the backward direction that are emitted toward the front side.

  In the light emitting device 120 according to the present embodiment, the outgoing light in the forward direction mainly includes light transmitted through the transmission / reflection surface 165 of the second light flux controlling member 160. Further, the outgoing light in the backward direction mainly includes light reflected by the reflecting surface 157 of the first light flux controlling member 150 and light reflected by the transmitting / reflecting surface 165 of the second light flux controlling member 160. Further, the outgoing light in the lateral direction mainly includes light transmitted through the transmission / reflection surface 165 of the second light flux controlling member 160, light reflected by the transmission / reflection surface 165 of the second light flux control member 160, and Light reflected by the reflecting surface 157 of the one-beam control member 150. Therefore, the balance of the emitted light in each direction is adjusted by adjusting the shape of the reflection surface 157 of the first light flux control member 150 and the shape and transmittance of the transmission reflection surface 165 of the second light flux control member 160. be able to.

(Simulation 1)
In order to confirm the effect of the light flux controlling member 140 according to the present embodiment (particularly, the effect of the first light flux controlling member 150), the light distribution characteristics of the illumination device 100 according to the above-described embodiment are simulated. It was. For comparison, an illumination device that does not have the light flux controlling member 140 (hereinafter, also referred to as “illumination device according to Comparative Example 1”) and a Fresnel lens portion 152 that is disposed so as to cover all of the plurality of light emitting elements 130. The light distribution characteristics were also simulated for each of the illumination devices including the luminous flux control member 140 having “(also referred to as“ illumination device according to Comparative Example 2 ”)”. Moreover, also in the illuminating device which concerns on the comparative example 1 and the comparative example 2, the five light emitting elements 130 are arrange | positioned on the board | substrate 125 (refer FIG. 3). In this simulation, the illuminance when all five light emitting elements 130 are turned on is arranged on a virtual spherical surface at a distance of 1000 mm from the light emitting element 130 arranged at the center of the substrate 125 and the diameter of the virtual circle C. The illuminance on the circumference of a circle formed by intersecting the virtual planes including the centers of the three light emitting elements 130 and extending along the optical axis LA direction of the plurality of light emitting elements 130 was calculated.

  FIG. 7 is a cross-sectional view illustrating a configuration of a light flux controlling member 140 ′ of the lighting apparatus according to Comparative Example 2. The light flux control member 140 ′ includes a first light flux control member 150 ′, a second light flux control member 160, and a holder 170. The first light flux controlling member 150 ′ has an incident area 151 ′ where light emitted from the light emitting element 130 is incident, and an emission surface 156 ′ that emits incident light toward the second light flux controlling member 160. The incident area 151 ′ does not have the incident surface 155 and includes only the Fresnel lens portion 152 ′. In light flux controlling member 140 according to the present embodiment, Fresnel lens portion 152 is disposed so as to cover only light emitting element 130 disposed at the center of substrate 125. On the other hand, in the light flux controlling member 140 ′ according to Comparative Example 2, the Fresnel lens portion 152 ′ is disposed so as to cover all (five) light emitting elements 130 disposed on the substrate 125.

  FIG. 8 is a graph showing simulation results of light distribution characteristics for the lighting device according to Comparative Example 1, the lighting device according to Comparative Example 2, and the lighting device 100 according to the present embodiment. In FIG. 8, the alternate long and short dash line indicates the result for the lighting device according to Comparative Example 1, the broken line indicates the result for the lighting device according to Comparative Example 2, and the solid line indicates the result for the lighting device 100 according to the embodiment. Is shown. In addition, the numerical values described on the outside of the graph indicate angles with respect to the optical axis LA (center axes CA1, CA2, CA3) of the plurality of light emitting elements 130. Moreover, the numerical value described inside the graph has shown the relative illumination intensity (maximum value 1) of each direction.

  As indicated by the alternate long and short dash line in FIG. 8, the lighting device according to Comparative Example 1 emits light mainly in the forward direction (−60 ° to + 60 °). As indicated by a broken line in FIG. 8, the illumination device according to Comparative Example 2 has a forward direction, a lateral direction (−120 ° to −60 °, + 60 ° to + 120 °), and a backward direction (−180 ° to −−). Light is emitted in all directions (120 °, + 120 ° to + 180 °). As indicated by a solid line in FIG. 8, the illumination device 100 according to the embodiment also emits light in all directions of the front direction, the side direction, and the rear direction. In the lighting device 100 according to the embodiment, the ratio of the outgoing light in the forward direction decreases and the ratio of the outgoing light in the lateral direction and the backward direction increases as compared with the lighting device according to the comparative example 2. I understood.

  The illumination device according to Comparative Example 1 does not have a light flux control member. For this reason, the light emitted in the forward direction from the light emitting element 130 is emitted in the forward direction as it is without controlling the light distribution. From a comparison between the illumination device according to Comparative Example 1, the illumination device according to Comparative Example 2, and the illumination device 100 according to the embodiment, the light flux controlling members 140 ′ and 140 are emitted from the light emitting element 130 in the forward direction. It can be seen that this contributes to sorting in the lateral direction and the backward direction.

  Further, the first light flux controlling member 150 ′ of the illumination device according to the comparative example 2 does not have the incident surface 155 and the reflecting surface 157. It can be seen that the illuminating device according to Comparative Example 2 emits light further forward in all directions including the forward direction, the lateral direction, and the backward direction, as compared with the illuminating device 100 according to the embodiment. Thereby, it can be seen that the reflecting surface 157 of the first light flux controlling member 150 according to the present embodiment contributes to distributing the emitted light from the light emitting element 130 toward the rear side.

(Simulation 2)
Next, in order to confirm the effect of the light flux controlling member 140 according to the present embodiment (particularly, the effect of the second light flux controlling member 160), a simulation of the light distribution characteristics of the lighting device 100 with the cover 180 removed is performed. went. For comparison, light distribution characteristics were also simulated for an illuminating device (hereinafter also referred to as “illuminating device according to Comparative Example 3”) in which the cover 180 was removed and the second light flux controlling member 160 was not provided. In this simulation, when all the five light emitting elements 130 are turned on, the light emitting element 130 arranged at the center among the three light emitting elements 130 on the virtual plane (the light emitting element 130 arranged at the center of the substrate 125). The simulation was performed for the case where only one light-emitting element 130 was turned on, and the case where only one light-emitting element 130 was turned on among the two light-emitting elements 130 arranged outside on the virtual plane. This simulation was performed under the same conditions as in simulation 1 except that the lighting devices were different.

  FIG. 9 is a graph showing a simulation result of the light distribution characteristics of the lighting device according to Comparative Example 3 and the lighting device 100 from which the cover 180 is removed. FIG. 9A is a graph showing a simulation result when all the five light emitting elements 130 are turned on, and FIG. 9B shows a light emitting element 130 (substrate) arranged at the center among the three light emitting elements 130 on the virtual plane. FIG. 9C is a graph showing a simulation result when only the light emitting element 130 arranged at the center of 125 is turned on, and FIG. 9C shows light emission of one of the two light emitting elements 130 arranged outside on the virtual plane. It is a graph which shows the simulation result at the time of lighting only the element 130. FIG. 9A to 9C, the broken line indicates the result for the lighting device according to Comparative Example 3, and the solid line indicates the result for the lighting device 100 with the cover 180 removed.

  First, simulation results when all the five light emitting elements 130 are turned on will be described. As shown by a broken line in FIG. 9A, in the illumination device according to Comparative Example 3, the ratio of the emitted light in the forward direction (−15 ° to + 15 °) is large, and the ratio of the emitted light in the lateral direction and the backward direction. It turns out that there are very few. On the other hand, as shown by a solid line in FIG. 9A, in the illumination device 100 that does not have the cover 180, the ratio of the emitted light in the forward direction (−15 ° to + 15 °) compared to the illumination device according to the comparative example 3. It was found that the ratio of outgoing light in the lateral direction and the backward direction (-145 ° to -70 °, + 70 ° to + 140 °) increased. From this result, the second light flux control member 160 outputs the light emitted from the first light flux control member 150 in the forward direction (−15 ° to + 15 ° direction) in the lateral direction and the backward direction (−145 ° to −70 °). , + 70 ° to + 140 °). Moreover, it turns out that the 2nd light beam control member 160 permeate | transmits a part of emitted light to a front direction (-15 degrees-+15 degrees).

  Next, a simulation result when only the light emitting element 130 arranged at the center (the light emitting element 130 arranged at the center of the substrate 125) among the three light emitting elements 130 on the virtual plane is turned on will be described. As shown by a broken line in FIG. 9B, in the lighting device according to Comparative Example 3, the ratio of the outgoing light in the lateral direction and the backward direction is very small, and the outgoing light in the forward direction (−15 ° to + 15 °). It can be seen that the ratio of is very large. Accordingly, the Fresnel lens portion 152 of the first light flux controlling member 150 efficiently collects the emitted light from the light emitting element 130 disposed at the center of the substrate 125 toward the central axis CA2 side of the second light flux controlling member 160. You can see that On the other hand, as shown by a solid line in FIG. 9B, in the lighting device 100 from which the cover 180 is removed, the ratio of outgoing light in the forward direction (−10 ° to + 10 °) compared to the lighting device according to Comparative Example 3. It was found that the ratio of outgoing light in the forward direction (± 15 °, ± 45 °), lateral direction (± 100 °), and backward direction (± 130 °) on the rear side increases. From this result, the second light flux control member 160 emits the light emitted from the light emitting element 130 disposed at the center of the substrate 125 and reaches the second light flux control member 160 in the forward direction (± It can be seen that this contributes to sorting in the direction of 15 °, ± 45 °, lateral direction (± 100 °) and backward direction (± 130 °). Moreover, it turns out that the 2nd light beam control member 160 permeate | transmits a part of emitted light to a front direction (-15 degrees-+15 degrees).

  Next, a simulation result when only one of the two light emitting elements 130 arranged outside on the virtual plane is turned on will be described. In the graph of FIG. 9C, of the two light emitting elements 130 arranged outside on the virtual plane, the direction in which the lit light emitting element 130 is arranged is defined as a negative (−) direction, and the direction on the opposite side is defined. The direction is positive (+). As shown by a broken line in FIG. 9C, in the lighting device according to Comparative Example 3, the light exits in the forward direction (+ 25 °, + 55 ° to + 65 °) and in the lateral direction and the backward direction (−135 ° to −95 °). It can be seen that the ratio of incident light is large. On the other hand, as shown by a solid line in FIG. 9C, in the illumination device 100 from which the cover 180 is removed, the emitted light in the forward direction (+ 25 °, + 55 ° to + 60 °) compared to the illumination device according to Comparative Example 3. It was found that the ratio of the emitted light in the lateral direction and the backward direction (-95 ° to -135 ° direction) increased. From this result, it can be seen that the second light flux controlling member 160 also contributes to emitting the emitted light from the light emitting element 130 disposed on the outside in the lateral direction and the backward direction. Moreover, it turns out that the 2nd light beam control member 160 permeate | transmits a part of emitted light to a side direction (+65 degree).

(effect)
The light flux controlling member 140 according to the present embodiment uses the light emitted from the light emitting element 130 arranged at the center of the substrate 125 (on the central axes CA1, CA2, CA3 of the light flux controlling member 140) as the first light flux controlling member 150. The Fresnel lens portion 152 can condense light on the central axis CA2 side of the second light flux controlling member 160. The light flux control member 140 can emit light emitted from the light emitting element 130 disposed at the center of the substrate 125 in the forward direction, the lateral direction, and the backward direction by the second light flux control member 160. Further, the light flux controlling member 140 can reflect the emitted light from the light emitting element 130 disposed at the center of the substrate 125 in the lateral direction and the backward direction by the reflecting surface 157. That is, the light flux controlling member 140 can appropriately control the light distribution of the emitted light from the light emitting elements 130 disposed on the central axes CA1, CA2, and CA3.

  Further, the light flux controlling member 140 can reflect the emitted light from the light emitting element 130 disposed outside the substrate 125 in the lateral direction and the backward direction by the reflecting surface 157. In addition, the light beam control member 140 can emit light emitted from the light emitting element 130 disposed outside the substrate 125 in the forward direction, the lateral direction, and the backward direction by the second light flux control member 160. That is, the light flux controlling member 140 can appropriately control the light distribution of the emitted light from the light emitting elements 130 arranged outside the plurality of light emitting elements 130.

  As a result, the illumination device 100 having the light flux control member 140 according to the present embodiment is arranged outside the light emitted from the light emitting elements 130 arranged on the central axes CA1, CA2, and CA3 of the light flux control member 140. In addition, the light emitted from the plurality of light emitting elements 130 can be distributed in a well-balanced manner in all of the forward direction, the lateral direction, and the backward direction. Therefore, the illuminating device 100 which has the light beam control member 140 which concerns on this Embodiment can be used equivalent to an incandescent lamp.

  In the above embodiment, as shown in FIG. 3, one light emitting element 130 is arranged at the center of the virtual circle C on the substrate 125, and four light emitting elements 130 are arranged on the circumference of the virtual circle C. The light emitting device 120 and the lighting device 100 arranged at intervals have been described. However, in the light-emitting device and the lighting device according to the present invention, one large light-emitting element 130 ′ may be disposed on the substrate 125 over the region where the five light-emitting elements 130 in the above embodiment are disposed. Good. For example, as illustrated in FIG. 10, one light emitting element 130 ′ that serves as a light emitting surface may be arranged on the substrate 125 so as to include the entire virtual circle C. In this case, one light emitting element 130 ′ is disposed at a position facing a part of the incident surface and the Fresnel lens portion. At this time, from the viewpoint of emitting light in a more balanced manner, it is preferable that the optical axis that is the center of the total luminous flux of the light emitting element 130 ′ coincides with the central axis of the first luminous flux control member.

  Since the illuminating device having the light flux controlling member according to the present invention can be used in place of the incandescent light bulb, it can be widely applied to various illumination devices such as a chandelier and an indirect illumination device.

DESCRIPTION OF SYMBOLS 10 LED module 20 Lens 21 Incident surface 22 Outgoing surface 100 Illuminating device 110 Case 111 Base 112 Case main body 120 Light emitting device 125 Substrate 130, 130 'Light emitting element 140, 140' Light flux controlling member 150, 150 'First light flux controlling member 151, 151 ′ incident area 152, 152 ′ Fresnel lens portion 153 refracting surface 154 convex strip 154a first inclined surface 154b second inclined surface 155 incident surface 156, 156 ′ emitting surface 157 reflecting surface 160 second light flux controlling member 165 transmitting and reflecting Surface 170 Holder 171 Front guide protrusion 172 Rear guide protrusion 180 Cover C Virtual circle CA1 Center axis of first light flux control member CA2 Center axis of second light flux control member CA3 Center axis of holder LA Optical axis of light emitting element

Claims (8)

A light flux controlling member for controlling light distribution of light emitted from at least one light emitting element,
An incident area that includes a Fresnel lens portion disposed so as to surround the central axis and an incident surface disposed outside the Fresnel lens portion, and that is incident on the light emitted from the light emitting element, and opposite to the incident region A first light emitting surface that is disposed on a side and emits a part of incident light incident on the incident region; and a reflection surface that is disposed outside the light emitting surface and reflects another part of the incident light. A light flux controlling member;
A second light flux controlling member that is disposed at a position facing the emission surface and the reflection surface, includes a transmission / reflection surface that transmits a part of the light emitted and emitted from the emission surface and reflects the remainder;
Have
The reflecting surface is a rotationally symmetric surface with the central axis of the first light flux controlling member as a rotation axis, and the outer peripheral portion thereof has an inner peripheral portion that is a concave curve with respect to the incident surface. Compared to the peripheral part, the distance between the optical axis that is orthogonal to the optical axis that is the center of the total luminous flux of the light emitting element and that passes through an arbitrary point on the incident surface is increased in the direction along the optical axis. And
The transmission / reflection surface is a rotationally symmetric surface with the central axis of the second light flux controlling member as a rotation axis, and its generating line is a concave curve with respect to the first light flux controlling member, and its outer peripheral portion However, compared to the central portion, the distance from the orthogonal plane in the direction along the optical axis is formed,
Luminous flux control member.   The light flux controlling member according to claim 1, wherein the incident surface is a flat surface. A substrate,
At least one light emitting element disposed on the substrate;
The light flux controlling member according to claim 1 or 2 disposed on the light emitting element,
Have
The light emitting element is disposed at a position facing a part of the incident surface and at least a part of the Fresnel lens part,
Light emitting device.   The light emitting device according to claim 3, comprising one light emitting element.   The light emitting device according to claim 3, comprising a plurality of the light emitting elements.   6. The light emitting device according to claim 3, wherein an optical axis that is a center of a total luminous flux of the light emitting element coincides with a central axis of the first luminous flux control member. An optical axis of one light emitting element among the plurality of light emitting elements coincides with a central axis of the first light flux controlling member,
At least one light emitting element among the remaining light emitting elements is disposed so as to overlap an inner edge of the reflecting surface when viewed from the second light flux controlling member side.
The light emitting device according to claim 5. The light emitting device according to any one of claims 3 to 7,
A cover that covers the luminous flux control member and diffuses and transmits the emitted light from the light emitting device;
A housing that supports the light emitting device and the cover;
A lighting device.